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First of all, you have to download and install a theme. You can do this by installing them from the Mi A1 Themes channel I made on Telegram. You will also have to install the 'Stock' theme that is pinned in the channel to be able to see the themes option. www.t.me/MiA1Themes

After you've done that, you have to go to settings, display, advanced and you'll see the Themes option at the bottom of the screen. Tap on that and choose you're theme of choise.